Bug 761646 – CVE-2011-4594 kernel: send(m)msg: user pointer dereferences

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Bug 761646 - (CVE-2011-4594) CVE-2011-4594 kernel: send(m)msg: user pointer dereferences

Summary:	CVE-2011-4594 kernel: send(m)msg: user pointer dereferences

Status:	CLOSED ERRATA

Aliases:	CVE-2011-4594

Product:	Security Response
Classification:	Other
Component:	vulnerability (Show other bugs)
Sub Component:
Version:	unspecified
Hardware:	All Linux

Priority	medium Severity medium
Target Milestone:	---
Target Release:	---
Assigned To:	Red Hat Product Security
QA Contact:
Docs Contact:

URL:
Whiteboard:	impact=moderate,public=20110825,repor...
Keywords:	Security

Depends On:	760798 761668
Blocks:	761664
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Reported:	2011-12-08 14:11 EST by Petr Matousek
Modified:	2016-11-08 10:50 EST (History)
CC List:	10 users (show)

See Also:
Fixed In Version:
Doc Type:	Bug Fix
Doc Text:
Story Points:	---
Clone Of:
Environment:
Last Closed:	2013-04-05 11:42:47 EDT
Type:	---
Regression:	---
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Documentation:	---
CRM:
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oVirt Team:	---
RHEL 7.3 requirements from Atomic Host:
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External Trackers
Tracker	ID	Priority	Status	Summary	Last Updated
Red Hat Product Errata	RHSA-2012:0350	normal	SHIPPED_LIVE	Moderate: kernel security and bug fix update	2012-03-06 18:43:05 EST

Groups: None (edit)

Description Petr Matousek 2011-12-08 14:11:10 EST

Dereferencing a user pointer directly from kernel-space without going through the copy_from_user family of functions is a bad idea. Two of such usages can be found in the sendmsg code path called from sendmmsg, added by upstream commit c71d8ebe7a4496fb7231151cb70a6baa0cb56f9a. Usages are performed through memcmp() and memcpy() directly. 

Upstream fix: http://git.kernel.org/linus/bc909d9ddbf7778371e36a651d6e4194b1cc7d4c

Acknowledgements:                                                               

Red Hat would like to thank Tetsuo Handa for reporting this issue. Upstream acknowledges Mathieu Desnoyers as the original reporter.

Comment 3 Petr Matousek 2011-12-09 08:51:26 EST

Statement:

This issue did not affect the versions of Linux kernel as shipped with Red Hat
Enterprise Linux 4, 5 and Red Hat Enterprise MRG as they did not provide support for the sendmmsg syscall. This has been addressed in Red Hat Enterprise Linux 6 via https://rhn.redhat.com/errata/RHSA-2012-0350.html.

Comment 4 errata-xmlrpc 2012-03-06 13:45:15 EST

This issue has been addressed in following products:

  Red Hat Enterprise Linux 6

Via RHSA-2012:0350 https://rhn.redhat.com/errata/RHSA-2012-0350.html

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